libsepol: sepol_av_to_string: clear static buffer

chenxiaolong reported this via
https://github.com/SELinuxProject/selinux/issues/23

A nicer fix would be to rework the interface to be more
like security_av_string() in libselinux, but that requires
updating all callers.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
1 file changed